While staying at Cottonwood Canyon State Park in Oregon, we decided we were interested in visiting Stonehenge. Wiltshire, England seemed like too far to go, so we went to Maryhill, WA which was only about 30 miles away.
The Maryhill Stonehenge, built by Sam Hill, was the first monument in the United States to honor the dead of World War I. The center altar stone is lined up with sunrise on the summer solstice. Hill had incorrectly believed that the original Stonehenge had been used as a sacrificial site, therefore constructed the replica as a reminder that humanity is still being sacrificed to the god of war.
If you are interested in visiting other Stonehenge replicas in the United States you can find a Roadside America map here.